Relay for telephones.



G. STILLE.

RELAY FOR TELEPHONES.

APPLICATION FILED JAN. 11; 1910.

1,099,406. Patented June 9,1914.

Wain asses CURT STILLE, OI? WILMERSDORF, NEAR BERLIN, GERMANY.

RELAY FOR TELEPHON ES.

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To all whom it may concern:

Be it knownthat I, Oun'r STILLE, doctor of philosophy, of Wilmersdorf, Germany, a subject of the King of Prussia, and whose post-ofli'ce address is 7 Lauenburgerstrasse, Wilmersdorf, near Berlin, Kingdom of Prussia, German-Empire, have inventeda new and useful Relay for Telephones, of which the following-is a specification.

The presentfinvention relates to rel'ays for telephones and other weak current apparatus, and which, as provedby experiments, are distinguished byvery high scnsitiveness. A relay of this kind is produced by causing two'coils having a contact resistance between them to move against one another in a strong magnetic field. One form of this relay is shown byway of example in'the accompanying drawing of which- Figure 1 is a sectionand Fig. 2 a side elevation.

,a designates the poles of a magnet, the core of which is b and which is energized from any suitable source of current by means of the coil 6. In the space'betwcen the magnet poles are two rotary coils or spools f arranged in series, but wound in opposite directions. In the interior of each spool is a carbon block 9. These carbon blocks are provided with cavities in their opposed faces, and the space so formed is filled with small carbon balls orv ains. In

order to prevent these small car 'n bodies from dropping out, a band or strip 11, preferably of glass wool, is placed around the carbon blocks. The return movement of the spools to their initial position can be efi'ected by torsional means, such, for instance, as two suspending threads it. These threads are attached to the hooks Z forming a bifilar suspension. 1 V

The operation of the relay is obvious from the drawing. An weak current traversing the spools ten s to adjust the magnetic axis of the spools coaxially with the direction of the constant magnetic .field. Since, however, the spools are oppositely wound, they move against One another, thereby influencing the contact member which is located between the spools.

What I do claim as my invention, and de- Specification of Letters Patent. Application filed January 11, 1910. Serial No. 537,514.

Patented J none 9, 1914.

sire to secure by Letters Patent of the United States, is

'1. In a relay for telephones and similar apparatus the combination with two rotatably suspended coils adapted to rotate in opposite directions toward each other, of a microphonic con-tact located within and influenced by the rotation of the coils, and

means for opposin the rotation .of the said coils, substantially as set forth.

2. In a relay for telephones and similar apparatus the combination with two rd tatably suspended coils adapted to rotate 1n opposite directions toward each other, and an electro-magnet adapted to produce a strong magnetic field, of a microphonic contact located within and influenced by the rotation of the coils and torsional means opposing the rotation of the said coils, sub stantially asset forth.

3. In a relay for telephones and similar apparatus the combination with two rotatably suspended coils adapted to rotate in opposite directions under the influence of a magnetic field, carbon blocks located in the interior of said coils, carbon balls interposed between said blocks to form a microphonic contact, a strip fastening the blocks together, and torsional means opposing the: rotation of the said coils, substantially as set forth.

4. In a relay for telephones and similar apparatus the combination with two, rotatably suspended coils adapted to rotate in opposite directions under the influence of a magnetic field, carbon blocks located in the' interior of said .coils, carbon. balls interposed between said blocks to form a microphonic contact, a strip fastenipg the blocks together and torsional springs 0pposing the rotation of the said coils.

5. In a relay for telephones and similar apparatus, the combination with two rotatably suspended coils adapted to rotate in opposite directions under the influence of a magnetic field, devices located in the interior of said coils, means interposed between s'aid devices 'to form a microphonic contact, and torsional means opposing the rotation of said. coils.

6. In a relay for telephones and similar .contact, means for fastening the-blocks tonesses. v 4

' gether and torsional means opposing-the rotation of said coils. I Witnesses? v In an electric relay, the combination HENRY HASPER,

f opposite directions under the-influence of -amagnetic field; blocks located in themepparatus, the combination with two rotatably suspended coils adapted to rotate in terior; of said coils, means interposedbe- In testimony whereof I have tween'said blocks to form a; microphonic of two rotatixbly suspended opposite1y} WOLDEMAR wound coils, bloeks withinsaid' coils, means I interposed between saidblocksto' form a microphonie contact; and torsional means opposmg the rotation ofsaidcoilsi 1'5 hereunto set my hand in presence of two subscribing 'witoun'r STILLEQ 

